from django.shortcuts import render
from django.views import View
from . import models
from django.core.paginator import Paginator, EmptyPage
from goods.models import SKU, GoodsCategory
# from goods.models import GoodsCategory
from django import http
from contents.utils import get_categories
from goods.utils import get_breadcrumb
from meiduo_mall.utils.response_code import RETCODE
from django.utils import timezone
from datetime import datetime
import logging

#  日志统计器
logger = logging.getLogger('django')
# Create your views here.
class DetailVisitView(View):
    """详情页分类商品访问"""
    def post(self, request, category_id):
        """记录分类商品访问量"""
        try:
            category = models.GoodsCategory.objects.get(id=category_id)
        except models.GoodsCategory.DoesNotExist:
            return http.HttpResponseForbidden('缺少必传参数')

        #  获取今天的日期
        t = timezone.localtime()
        today_str = '%d-%02d-%02d'%(t.year, t.month, t.day)
        today_date = datetime.strptime(today_str, '%Y-%m-%d')

        try:
            #  查询今天的访问量
            counts_data = category.goodsvisitcount_set.get(date=today_date)
        except models.GoodsVisitCount.DoesNotExist:
            #  如果该商品今日没有被访问过就新建一个访问记录
            counts_data = models.GoodsVisitCount()

        try:
            counts_data.category = category
            counts_data.count += 1
            counts_data.save()
        except Exception as e:
            logger.error(e)
            return http.HttpResponseServerError('服务器异常')
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK'})


class DetailView(View):
    """商品详情页"""
    def get(self, request, sku_id):
        """提供商品详情页"""
        #  获取当前sku的信息
        try:
            sku = models.SKU.objects.get(id=sku_id)
        except models.SKU.DoesNotExist:
            return render(request, '404.html')

        #  查询商品频道分类
        categories = get_categories()
        #  查询面包屑导航
        breadcrumb = get_breadcrumb(sku.category)

        # 构建当前商品的规格键
        sku_specs = sku.specs.order_by('spec_id')
        sku_key = []
        for spec in sku_specs:
            sku_key.append(spec.option.id)
        # 获取当前商品的所有SKU
        skus = sku.spu.sku_set.all()
        # 构建不同规格参数（选项）的sku字典
        spec_sku_map = {}
        for s in skus:
            # 获取sku的规格参数
            s_specs = s.specs.order_by('spec_id')
            # 用于形成规格参数-sku字典的键
            key = []
            for spec in s_specs:
                key.append(spec.option.id)
            # 向规格参数-sku字典添加记录
            spec_sku_map[tuple(key)] = s.id
        # 获取当前商品的规格信息
        goods_specs = sku.spu.specs.order_by('id')
        # 若当前sku的规格信息不完整，则不再继续
        if len(sku_key) < len(goods_specs):
            return
        for index, spec in enumerate(goods_specs):
            # 复制当前sku的规格键
            key = sku_key[:]
            # 该规格的选项
            spec_options = spec.options.all()
            for option in spec_options:
                # 在规格参数sku字典中查找符合当前规格的sku
                key[index] = option.id
                option.sku_id = spec_sku_map.get(tuple(key))
            spec.spec_options = spec_options

        #  渲染页面
        context = {
            'categories': categories,
            'breadcrumb': breadcrumb,
            'sku': sku,
            'specs': goods_specs,
        }

        return render(request, 'detail.html', context)


class HotGoodsView(View):
    """商品热销排行"""
    def get(self, request, category_id):
        """提供商品热销排行的json数据"""
        #  根据销量倒叙
        # print(category_id)
        # skus = SKU.objects.filter(id=category_id, is_launched=True).order_by('-sales')[:4]
        skus = SKU.objects.filter(category_id=category_id, is_launched=True).order_by('-sales')[:2]

        #  序列化
        hot_skus = []
        for sku in skus:
            hot_skus.append({
                'id': sku.id,
                'default_image_url': sku.default_image.url,
                'name': sku.name,
                'price': sku.price
            })
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK', 'hot_skus': hot_skus})



class ListView(View):
    """商品列表页"""
    def get(self, request, category_id, page_num):
        """提供商品列表页"""
        #  判断category_id 是否正确
        try:
            category = GoodsCategory.objects.get(id=category_id)
        except GoodsCategory.DoesNotXiist:
            return http.HttpResponseNotFound('GoodsCategory does not exist!')

        #  接收sort参数：如果用户不传就按照默认排序
        sort = request.GET.get('sort', 'default')

        #  查询商品频道分类
        categories = get_categories()

        #  查询面包屑导航
        breadcrumb = get_breadcrumb(category)

        #  按照排序规则查询该分类商品SKU信息
        if sort == 'price':
            #  按照价格由低到高排序
            sort_field = 'price'
        elif sort == 'hot':
            #  按照销量由高到低排序
            sort_field = '-sales'
        else:
            #  其他方式都默认为default
            sort = 'default'
            sort_field = 'create_time'
        skus = SKU.objects.filter(category=category, is_launched=True).order_by(sort_field)

        #  创建分页器
        paginator = Paginator(skus, 5)
        #  获取每页商品数据
        try:
            page_skus = paginator.page(page_num)
        except EmptyPage:
            return http.HttpResponseNotFound('empty page')

        #  获取列表页总页数
        total_page = paginator.num_pages

        #  渲染页面
        context = {
            'categories': categories,
            'breadcrumb': breadcrumb,
            'sort': sort,
            'category': category,
            'page_skus': page_skus,
            'total_page': total_page,
            'page_num': page_num,
        }
        return render(request, 'list.html', context)
